java第三周作业

//输入一个年份,判断是不是闰年(能被4整除但是不能被100整除,或是能被400整除)

package doom1;

import java.util.Scanner;

public class thethreeweekwork1 {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		
		Scanner input =new Scanner(System.in);
		
		System.out.print("请输入一个年份:");
		
		int i = input.nextInt();
		
		if(i%4==0 && i%100!=0||i%400==0){
			System.out.println(i+"年是闰年");
		}else{
			System.out.println(i+"年不是闰年");
		}
		
	}

}

　　

//输入一个4位会员卡号,如果百位数字是3的倍数,就输出是幸运会员,否则就输出不是

package doom1;

import java.util.Scanner;

public class thethreeweekwork2 {

	public static void main(String[] args) {
		// TODO Auto-generated method stub

		Scanner input = new Scanner(System.in);

		System.out.print("请输入会员编号:");
		int i = input.nextInt();
		if (i < 1000) {
			System.out.println(i + "不是会员编号");
		} else if ((i % 1000 / 100) % 3 == 0) {
			System.out.println(i + "恭喜您是幸运会员");
		} else {
			System.out.println(i + "很抱歉您不是幸运会员");
		}

	}
}

　　

/*							  	x+3		(x>0)
 已知函数值,输入x,输入对应的y.y=	 0		(x=0)
 								x*2-1	(x<0)
*/

package doom1;

import java.util.Scanner;

public class thethreeweekwork3 {

	public static void main(String[] args) {
		// TODO Auto-generated method stub

		Scanner input = new Scanner(System.in);

		System.out.print("请输入x的值:");
		int i = input.nextInt();
		if (i>0) {
			System.out.println("y的值为"+(i+3));
		} else if (i == 0){
			System.out.println("y的值为"+(0));
		} else if(i<0){
			System.out.println("y的值为"+(i*i-1));
		}
	}

}

　　

//输入三个数,判断是否能构成三角形(任意两边之和大于第三边)
package doom1;

import java.util.Scanner;

public class thethreeweekwork4 {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		Scanner input = new Scanner(System.in);
		System.out.print("请输入第一个数:");
		int a = input.nextInt();
		System.out.println();
		System.out.print("请输入第二个数:");
		int b = input.nextInt();
		System.out.println();
		System.out.print("请输入第三个数:");
		int c = input.nextInt();
		if(a+b>c||a+c>b||b+c>a){
			System.out.println(a+" "+b+" "+c+" "+"可以构成三角形");
		}else{
			System.out.println(a+" "+b+" "+c+" "+"不能构成三角形");
		}

	}

}